Threading and other tool.



- e. AMBORN.

THREADING AND OTHER fooL. APPLICATION LED MAR-'20, 1912-.

v Y j INYENTOR' WITNESSES: v

H By zzollzeys,

'ms COLUMBIA nugooiul n ed} WASHINGTD 45 is about 60, and I have hence shown the "UNITED sTaTns T TQENT orrion.

GEORGE AMIBORN, OF GHAPINVILLE, CONNECTICUT; ASSIGNOR TO-J. H. WILLIAMS-8t 00., OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

THREADING AND OTHER TOOL.

Patented Feb.8,1916.

Application filed March 20, 1912. Serial No. 684,980.

' To all whom it may concern:

new and useful Improvements in Threading Be it known that I, GEORGE AMBoRN, a

and other Tools, of which the following is a specification.

This invention relates to threading and other tools and aims to provide certain improvements therein.

' The invention is particularly directed to a threading tool and means for holding it or operating it, the object being to simplify the construction of tool and holder. To this end in the preferred form of my-invention I provide a threading tool in the form of a plane bar cutter which preferably has its working edge inclined to less than a right angle, and means for holding the cutter in such position with regard tothe work to be threaded that a plane perpendicular to the longitudinal axis of the work will bisect the angle formed by the two cutting edges of the cutter.

. The invention also includes certain other features of improvement which will be here inafter more fully pointed out.

Referring to the drawings which illustrate the invention, Figure l is a top view of the invention. Fig. 1 is a detail view, in side elevation, of the fastening cam. Fig. 2 is a side view of Fig. 1. Fig. 3 is a section taken on the line 3-3 in Fig. 1.

Referring first to Figs. 1 to 3, let A indicate the head of the tool holder, and B its shank, the latter being extended at an angle. indicates a threading tool which is shown as comprising a bar of square or other rectangular cross-section, such cutter being formed at its end with a face which is dis posed angularly to one of the sides of the cutter in such relation thereto as to correspondto the angle between the threads to be cut. In ordinary thread work this angle cutting edge D on the ends of the cutter disposed at a corresponding angle viz'. 60 to the cutting edge E on the side of the. cutter.

' edges D and E of the cutter.

If such a cutter were presented to the work with 1ts longitudinal axis perpendicular to the: work, it is obvious that the sides of the thread wouldnot correspond in their pitch;

Heretofore it has been usual toform the end of the cutter with a beveled working face but this necessitates the sharpening of two faces when the cutter is dull- By the present invention the cutter of the form described which requires only the sharpening of a single face may be utilized by the provision of a suitable means for supporting it at such angle to the work that the sides of the thread have an equal slope, or in other.

words at such angle that a perpendicular line from the work intersecting the end of the cutter would divide the'latter into two equal angles. In the construction shown the head A is formed with a cutter holding slot F which extends at the proper angle to the axis Z of the holder, the axis Z being the axis of the tool holder which is perpendicular to the work when the holder is in working position in a lathe, which axis'will be hereinafter referred to as the longitudinal axis of the holder. The axis Z of the holder will bisect the angle formed between the Suitable means are provided for holding the cutter in the slot. This slot F is preferably formed parallel with the shank B of the holder and the head A of the holder is also preferably provided with a face Y parallel to the axis Z of the holder. The face Y is of utility in setting the tool-holder in the lathe, the face Y presenting a flat surface to an implement which may be used in setting the tool-holder with relation to the work.

The clamping means forholding the tool may be of any desirable construction, but my invention provides a means for this purpose which are especially adapted for this class of tool. This means comprises essentially a cam member G which is preferably adapted to fit in a socket H formed in the head A of the tool immediately above the cutter C. The cam member is formed with a cam face I which is in the general shape of a spiral and which presses downiuponthe tool as the cam is rotated. In the construction shown in Figs. 1 to 3 a groove J is provided in the cam face which is adapted to receive a small screw pinK whereby to hold the cam in position withinthe holder. The cam is also provided with a bearing face L on its outer side and a similar hearing face M on its inner side, which bearing faces serve to transmit the strainto the walls of the head of the holder when the cam is brought into engagement with the tool. The cam is provided with some means whereby it may be turned, such as the wrench socket 0. By this construction ,the tool may be very firmly fixed in position by a very quick movement of the cam, and when so fixed it" exerts no substantial tendency to loosen inuse.v Moreover, the clamping action is not dependent upon any threads or other partsliable to be broken. If .by any possibility the camis injured, it can be easily removed without the necessity of drilling it or boring it out.

While I have shownand described; several embodiments of the invention, it will be understood that I downot wish to be limited thereto, as changes may be made therein withinothe scope of the claims without departing from the invention.

WhatI claim is: Y a a 1.' A thread-cutting tool comprising a bar: shaped cutter and a tool holder, said cutter having a straightedge lengthwise thereof adapted to form a continuous straight cutting edge, and a second cutting edge at an angle to said lengthwise edge, said lengthe wise edge being adapted to have successive portionsthereof brought into use by successive grindings of said second .angularlydisposed edge, said tool holder being T adapted to hold said cutter at such an angle to the work that a perpendicular to the work bisects the angle formed by the two aforesaid cutting edgesoof the cutter,- whereby an equilateral groove may be cut.

2. A thread-cutting tool comprising a banshaped cutter and a tool-holder, said cutter having a straight edge lengthwise thereof adapted to form a continuousst-raight cut. ting edge and a second cutting edge at an angle to said lengthwise edge, saidlengthwise edgebeingradapted to have successive portions thereof brought, into use; by successive grindings of said second an'gularly disposed edge, said tool-holder being adapted to hold said cutter at such an angle that the longitudinal axisZ of the holder bisects the angle formed by the two aforesaid cutting edges of the cutter,- said tool-holder having a shank on the cutter side thereof at an angle to said longitudinal axis.

, 3. A thread-cutting toolcomprisin'g a bar: shaped cutter and a tool-holder, said cutter having it straight edge lengthwise thereof adapted to form a continuous straight cutting edge and a second cutting edge at an angle to said lengthwise edge, said lengthwise edge being adapted to have successive portions thereof brought into useby successivegrindings of said second angularlydisposed edge, said tool-holder being adapted to hold said cutter at such an angle that the longitudinal aXiS Z" of the holder bisectsthe angle formed by the two aforesaid cutting edges of the cutter, said tool-holder having a shank on the cutter side thereof substantially parallel to said lengthwise edge of the cutter;

4. A tool holder for thread-cutters, comprising a shank and a fixed head having a tool recess therein, saidtool recess being angularly disposed with relation to the longitudinal axis Z- of the-holder", said shank being disposed substantially parallel to said tool recess on the side oppositethe cutter side of the tool. i

5. A tool holder for thread cutters-comprising. a shank and .a fixed. headv having a tool recess therein, said tool recess being angularly disposed with relationtothe longitudinal axis Z of the holder, said shank beingdisposed substantially parallel to said tool recess, saidtooli holder also having a face Yat an, angle to said tool recess and adapted to present a flat face; to an implement used in setting the tool holder with relation to thepwork- 1 v 6 A tool holder for thread cutters comprising a shank and a fixed head having a tool recess therein, said tool recess being angularly disposed with, relation to the longitudinal axis Z of the holder, said shank being disposed substantially parallel to said tool recess, said tool holder having means forwclamping a cutter said recess,,said means being operable from the sideof the holder opposite theshank. H v U 7. A thread cutting tool comprising a barshaped cutter and a tool holder,- said cutter havinga straight edge lengthwise thereof adapted to forma continuous straight cutting, edge, and a second cutting edge at an angle to said lengthwise sedge, said lengthwise edge being adapted-to have successive portions thereofbrought into use by successive grindings of said second angu larly-di'sp osed edge, said tool holder having a front face substantially perpendicular to a line which bisects the a gle formed between said cutting edges of thecutter.

A .8. A thread cutting tool comprising a barshaped cutter and a tool holder, said cutter having a straight edge lengthwise thereofadap'tedto form a continuous straight cutting edge, and a secondcutting edge at an angle to said lengthwise ,edge, said lengthwise edge being adaptedto have successive portions thereof brought into use by successive grindings of said second an- In Witness whereof, I have hereunto gularly-disposed edge, said tool holder have signed my name in the presence of two subing a front face substantially perpendicular scribing Witnesses.

to a line which bisects the angle formed be- GEORGE AMBORN. tween said cutting edges, of the cutter, and Witnesses:

a shank angularly inclined with relation to CHARLES B. HARRIS,

said bisector on the cutter side of the holder. WILLIAM G. COLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. 0. 

